Finally I ended using (it's also working for different languages of Recaptcha challenges) if someone searches for the same:
">CSS>iframe[src^=' https://www.google.com/recaptcha/api2/bframe ']>FRAME> >CSS>#recaptcha-verify-button"
@GaG Thanks for the reply. I've tried English CC way too. But his BAS is in Russian so really find difficulty in getting what steps he's performing.
Anyway Thanks
